Spabk-abbesteb



SPARK-ARRESTER.

UNITEDsTATEs PATENT `oIIIaICI..

GILBEIiT RICHARDS, or CUMMINGTON, MASSACHUSETTS.

Specification of Letters Patent No. 12,829, dated May 8, 1855.

To all whom i mag/@concern Be` it known thatl, `GILBERT RICHARDS, ofCummingtom in the county of Hampshire and State of Massachusetts,haveinvented a new and Improved Sparl-Arrester, to be Applied to theSmokefPipes of Locomotives; andI do hereby declare thatthe following isafull, clear,and'exact description of the same, reference being Ihad tothe.` annexed drawing, `making af part of this specification, saiddrawing being a verticalsectionfofiniy improvement. s s gl, f

The natureof my invention consists in placing within `the usualinvertedconical casing at the top `ofthe smoke box a spiral flange, theupper edge of whichis attached to or in `closecontact with the innersideof the casing the lowerfedge of the flange incliningfinward towardthe center so l, as to forni an acute angular recess around, thecasing."` And using in connection with the spiral flange a suitablenumberfof deflecting plates arranged as will be presently shown.

To enable others skilled in the artto fully understand and construct myinvention, I will proceed to describe it. s

A, represents `an inverted conical casing, constructed inthe usualmanner, and B, represents a` `Spiral flange placed V'within the casingA. Thislflange may be formed of a single strip `of sheet metal ofrequisite breadth bent in spiralform, the upper edge of the flange beingattached to, or placed'in close contact with the inner side of the cas`ing and the lower edge bent inward so as to v form acute angularrecesses (a) around the innerside of the casing HC, is a verticalrodplaced `within the casing A, andsecuredpermanently at its center inany propermanner. On this rod C, there are secured two or moredeflecting plates D, the lower Surfaces of which are convex. The platesD, are circular and their diameters vary so as to correspond with thespace between the lower edges of the flange B, imme diately beneath it.y i

The sparks `it willbe seen as they are carried upward bythe draft willbe thrown by the deflecting `plates D, into the angular recesses(a.)f0r,1ned bythe flange B, the sparks having a vtendency to passtherein owing to their momentum, while the smoke will pass aroundlthe`edge of the plates D, and ascend through the center of the casing'as shown by the arrows the sparks being represented by dotted arrows. sy

The above invention is extremely simple and will operate well. Thespiral flange while it arrests the sparks does not form a barrier tothedraft because there is affree spiral passage all around theI inner sideof the casing. Concentric flanges would be objectionable or would notanswer as good a purpose, as they would in a measure obstruct the draft.

`Having thus described my invention what I claim asl new and desire tosecure by Letters Patent, isi i The spiral flange B, and deflectingplates D, arranged as herein shown and for the purpose as set forth.

GILBERT RICHARDS.

